All down to your own really.
Although I have great admiration for those who restore to factory spec, it is not for me. I, we as the Mrs. does the spraying, build to use and stop corrosion as much as I can.
The Series is in the workshop for the last stage on the - hopefully - last rebuild and it is totally not as it left the factory. But it will not rust, have good brakes, nice engine and working electrics.
If you're happy with what you do it is good.